Calle p



(No Model.) L

. o. P. NIXHOLM.

LOCK.

No. 506,792. Patented Oct. 17,1893.l l

UNITED STATES PATENT OFFICE.

CALLE P. NIXHOLM, OF HECLA, MONTANA, ASSIGNOR OF ONE-THIRD TO CHARLESRUNDBERG, OF SAME PLACE.

LOCK.

SPECIFICATION forming part of Letters. Patent No. 506,792, dated October17, 1893. Application tiled .Tune 6, 1893. Serial No. 476.769. (Noinodel.)

To a/ZZ whom it may cyl/werft:

Be it known that I, CALLE P. NIXHOLM, a subject. of the Czar of Russia,residing at Hecla, in the county of Beaver and State of Montana, haveinvented a new and useful Lock, of which the following is aspecification.

My inventionrelates to improvements in locks; and the objects in Vieware to provide a look of cheap and simple construction and which isproof against picking or of a suc-` cessful tampering therewith by anunauthorized person.

Other objects and advantages of the in vention will appear in thefollowing description, and the novel features thereof will beparticularly pointed out in the claims.

Referring to the drawingsz-Figure 1 is a perspective view of a lockembodying my invention, the face-plate of the lock being removed. Fig. 2is a vertical transverse sectional view through the key-guiding pin ofthe lock. Fig. 8 is a detail in perspective of the bolt. Fig. 4 is asimilar view of the twin springs. Fig. 5 is a detail in elevation of thekey for operating in the lock. Fig. 6 is a reverse view of the faceplate.

Like numerals of reference indicate like parts in all the figures of thedrawings.

The lock-case 1 is of the usual rectangular shape, and is provided atone end with the ange 2 having the bolt-opening 3. In this opening, anda keeper Lielongitudinally align` ing therewith, there is mounted forreciprocation the bolt 5. The bolt 5 is provided upon its under sidewith a pair of depending lugs 6 and upon its upper side at its oppositeedges with a pair of shoulders 7 whose front edges are inclined andwhose rear edges are abrupt. A bracket arm 8 extends from the back wallof the lock and supports in connection with said wall a transverse pin9. A similar bracket 10 extends from said back wall in front of thebracket arm 8 and in connection with the back wall supports a similarpin 11. Upon the pin 9 there are loosely mounted the inner or rear endsof al pair of iiat or what might be termed twin-springs l2, the samebeing arranged side by side. The

inner or rear ends of these springs are shaped to form eyes 13, whichreceive and are loosely mounted upon the pin 9, the opposite orfront'ends of the springs being cut away to form notches or shoulders 14 forengaging with the shoulders 7 of the bolt, and to one side or beyondsaid shoulders 14 provided with depending camportions 15, which embracethe opposite sides of the bolt. Between their endsthe springs pass underthe pin 11, and are thus maintained in such a position as to bear uponthe bolt. y

Supported upon a series of posts 16 between the `face-plate and backwall of the lock and extending from the under side of the bolt to thelower wall of the lock, is a partition or diaphragm 17 which is providedwith a keyhole 18, through the eye of which there eX- tends from theback wall a pin 19 for the purpose of guiding the key hereinafterdescribed. v

Upon the outer side of the diaphragm 17 and upon the inner face of theback wall of the lock casing there are respectively mounted circularwards 2O and 2l, which wards are out away at those points where theyintersect the key-hole. A similar though smaller vward 22 is upon theunder side of the diaphragm, and a corresponding ward 23 is formed uponthe under side of the face plate 24 of the lock-casing. There is alsoformed upon this face-plate an inclosing flange 25, which might be saidto act in the capacity of a ward.

Referring to Fig. 5, 25 designates the stem or body of the key, which isprovided at one end with the usual bow and at the opposite end: with theweb 27. This web is provided with a central slot radiating from the stemto the outer end of the web and at a right angle to the stem, the slotbeing designed to receive the diaphragm of the lock, and thebifurcations thus formed of the web are provided in their upper andlower edges and near their inner and outer ends with wards or'notches,29, which receive the several circular wards heretofore described asbeing formed upon the inner and outer faces of the diaphragm, the backwall of the lock, and the face Aplate thereof. The key having 4beeninserted in the slot or key-holeto which it is guided through the mediumof the key guiding pin or spindle, it will be seen that the same may berotated, the wards of the key fitting those of the lock, and that thebifurcations thereof roo will engage with the lugs 6 at the inner andouter sides of the bolt, thus movingsaid bolt forward or to a shotposition and into the keeper. The bolt is steadied in its movement bymeans of a curved fiat spring 30 secured to the upper wall of thelock-case and bearing at its upper end upon the upper side of the bolt.When thus shot it will be seen that the shoulders of the bolt passbeyond the ends of the twin springs so that the shoulders of the latterdropfbeyond the shoulders of the bolt and prevent a retraction of thebolt without a previous or simultaneous elevation of the springs,whereby a disengagement of the springs and bolt is effected. In order toaccomplish such retraction the springs, as before stated, are providedupon their under sides with the cams l5, which are rounded at both endsand lying between the lugs 6 at each side of the bolt are operated uponby the bifurcations of the web of the key before the rear lugs are actedupon by said bifurcations and hence by a retrograde rotation of the key,the springs are first elevated and subsequently the rear lugs areengaged with and the bolt moved back out of a locked or shot position.

Itwill be seen that the complexity of the different Wards, employment ofthe diaphragm, &c., all combine to produce a lock which itis next toimpossible to pick or open with any key but the proper one, andhencethough of similar construction the lock is exceedingly safe and may berelied upon for all ordinary use.

Various changes in the details of the invention will be readily madewithout deviating from the spirit or sacrificing any of the advantagesthereof, and I therefore do not limit my invention to such precisedetails of construction as I have herein shown and described.

Having described my invention, `what I claim is- 1. In a lock, thecombination with the casing, a diaphragm between the front and backwalls thereof, a key-hole formed in the front walland the diaphragm,aspindle extending from the back wall through the key-holes thus formed,and a series of wards arranged upon the diaphragm, back, and frontwalls, of a bolt arranged above the diaphragm and having lugs at itsopposite edges embracing the diaphragm, shoulders on the bolt, and apair of flat springs pivoted in the casing, bearing on the bolt providedwith shoulders for engaging therewith, and beyond said bolt at oppositesides provided with cam portions upon their under sides, substantiallyas specified.

2. In a lock, the combination with the casing, the intermediatediaphragm, the keyhole formed in the casing and diaphragm, thekey-guiding spindle extending from the back wall of the casing throughthe key-holes thus formed, the inner and outer Wards formed upon theinner and outer sides of the diaphragm and of different diameters, theward formed upon the back wall agreeing with that upon the outer side ofthe diaphragm,the ward formed upon the Ainner side of the front wall andagreeing in diameter with that upon the inner side of the diaphragm, ofthe superimposed bolt provided at opposite sides of the diaphragm with apair of depending lugs and between the same upon its upper side and atits opposite edges with shoulders inclined at their front edges andabrupt at their rear edges, a flat steadying spring secured to the upperange or Wall of the casing and bearing upon the bolt, the bracket arms 8and l0 supporting the transverse pins 9 and V11, respectively, the iiatsprings'lQ having eyes 13 engaging the pin 9 and passed under the pinll, said springs having theirfront ends shouldered as at 14 to engagewith the shoulders of the bolt and at opposite sides thereof providedwith the depending curved cam portions l, substantially as specified.

3. In a lock, the combination with the lockg casing, a key guide andopening, of keepers, a reciprocating bolt arranged in the keepers, lugsdepending from the under side of the bolt, a shoulder arranged upon theupper side of the bolt and having an inclined front face and a rearabrupt end,a flat spring pivoted in the casing and bearing upon the boltin line With the shoulder, said spring havinga notch for engaging therear end of the shoulder and provided upon its outer side with adepending cam portion, substantially as specified.

4:. In a lock, the combination with the casing, a diaphragm between thefront and back Walls thereof, and a key-hole formed inthe front wall andthe diaphragm, of a boltarranged above the diaphragm, and a pair of flatsprings pivoted in the casing, bearing on the bolt, and beyond said boltat opposite sides provided with cam portions upontheir under sides,substantially as specified.

In testimony that I claim the foregoing as my own I have hereto affixedmysignature in the presence of two witnesses.

CALLE P. NIXHOLM.

Witnesses:

G. G. EARLE, B. BRADFORD.

IOO

